Allow zero capacity
Allow zero capacity

erimatnor/skydns-kubernetes,nicescale/skydns,netf/skydns,zhang0137/skydns,loveshell/skydns,andrewrothstein/skydns,zvelo/zvelo-skydns,weekface/skydns,ZeaLoVe/skydns,tuannvm/skydns,smarterclayton/skydns,vinhhrv/skydns,AdoHe/skydns,skynetservices/skydns,yonglehou/skydns,tonicbupt/skydns,hw-qiaolei/skydns,no2key/skydns